Modeling Loss / Average Loss
  |
  |-- Loss without Zeroes
  |     |
  |     |-- Gamma
  |     |
  |     `-- Inverse Gaussian
  |
  |-- Loss with Some Zeros
  |     |
  |     |-- Intercept-only ZAGA (Zero-Adjusted Gamma)
  |     |
  |     |-- Intercept-only ZAIG (Zero-Adjusted Inverse Gaussian)
  |     |
  |     `-- Tweedie
  |
  |-- Loss with Many Zeros
  |     |
  |     |-- ZAGA (Zero-Adjusted Gamma)
  |     |
  |     `-- ZAIG (Zero-Adjusted Inverse Gaussian)
  |
  `-- Loss with Nonzero Threshold Xm
        |
        |-- Tobit
        |
        |-- Pareto
        |
        `-- Shifted Response with Y' = Y - Xm or Y' = Ln(Y / Xm)